Repair Information for Reconnection of Rear Window (Defroster) Contact or Tab – 2015-2020 Cadillac Chevrolet & GMC

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Service Bulletin Bulletin No.: 16-NA-171
Date: December, 2020
TECHNICAL
Subject: Repair Information for Reconnection of Rear Window (Defroster) Contact or Tab
Brand: Model:
Model Year: VIN: Engine: Transmission:
from to from to
Cadillac Escalade Models 2015 2020 All All
Chevrolet Suburban Models 2015 2020 All All
Chevrolet Tahoe Models 2015 2020 All All
GMC Yukon Models 2015 2020 All All
Additional
Options
(RPO)
Equipped With Electric Rear Window Defroster (RPO C49)
Involved
Region or
Country
North America, Europe, Uzbekistan, Russia, Middle East, Iraq, Israel, Palestine, Argentina, Brazil, Bolivia, Chile,
Colombia, Ecuador, Paraguay, Peru, Uruguay, Venezuela, Japan, Cadillac Korea (South Korea), GM Korea
Company, China, Taiwan, Thailand, Singapore, Philippines, Egypt, Other Africa, South Africa
Repair Suggestions
The generic procedure below is not very time intensive,
but does include minor preparation work to create a
good bonding surface. Be sure to follow each of the
steps, as combined they will produce the strongest
bond possible. Please consider the following before
attempting the repair:
1. If it is winter, bring the vehicle into the service
garage and remove any snow from the back
window area. Time must be allowed for the glass
to warm to the temperature inside the building.
Caution: Heating the glass excessively, or repeatedly
without time to cool, may result in glass breakage.
ALWAYS wear safety glasses when performing this
repair!
Important: Most rear glass has a black painted
masking around the edge of the glass. When cleaning
up the connection surface, be very careful not to
damage the surface of the black shading or the surface
of the glass.
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2. Mask off a small area around where the terminal
was originally.
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3. Prepare the surface of the used defroster tab and
the defroster buss bar with fine grain (500 grit)
sandpaper or Emery cloth. It is not necessary to
remove all of the original solder, but it should be
scuffed sufficiently so that no oxidation is present.
Lightly sand the area to prep the defogger grid.
The photo above shows a close up of a properly
prepared surface.
Important: If the original defroster tab is bent or
broken in any way, replace with new defroster tab.
Important: Do not sand through the defroster grid.
2000238
4. Wipe the newly prepared contact areas with Kent
Automotive* Acrysol™ (or equivalent) to remove
any residual oil or dirt.
5. Spray the defroster grid and the terminal feet with
the Loctite 736 Primer.
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6. Apply a small drop of the Loctite 312 to the foot of
the terminal.
Note: Some defroster tabs have two feet.
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7. Press the terminal onto the defroster grid and hold
for 1 minute. After releasing allow 5 minutes to
form a secure bond.
Note: If too much Loctite 312 adhesive was applied,
the Loctite Primer 736 can be reapplied while holding
the terminal in place.
Important: Try to align the new contact so that it is
positioned with the same orientation as the original
contact
Bulletin No.: 16-NA-171 December, 2020 Page 3
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8. Dispense equal parts of the tab bonding epoxy.
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9. Mix the epoxy thoroughly for 45 seconds. There is
a 2 minute work time once the epoxy is mixed.
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10. Apply the epoxy to completely cover the terminal
foot/feet and the prepared area of the defroster
grid. Smooth out the epoxy for a good contact
between the terminal and defroster grid within the
two minute work time.
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11. Remove the tape.
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12. Apply light heat between 100-150° F (38-65° C)
not to exceed 150° F (65° C).
Note: Placing the opposite hand under the glass at the
terminal while heating the terminal will prevent
overheating the epoxy. Once the glass becomes hot to
the touch, remove the heat.
13. Recheck the epoxy in 10 minutes to verify the
epoxy has firmed up. If the epoxy remains soft
reapply heat while touching the opposite side of
the glass. The second application of heat only
needs to be brief enough to reach 100°F (38 °C).
Allow the epoxy to cure for 24 hours at
approximately 75°F (24 °C) or at the temperature
inside the building, before reattaching the harness
connector and returning the vehicle into service.
Parts Information
Description Part
Number
Qty
Kent Automotive Acrysol™
Solvent (32 fl oz) 946 ml*
P20005 1
Loctite 312 Adhesive
Speedbonder Combination
Pack (contains Loctite 312
adhesive and Loctite 736
Primer)
03333 1
TERMINAL,R/CMPT L/
WDO WRG HARN 84336364 1
2000 Tab Bonding Kit Epoxy Kit ** 1
*or equivalent product
**Available from Planned Products LLC,
www.frostfighter.com or by phone: (303) 682-0274
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor
Operation
Description Labor Time
2080668* Reconnection of Rear
Window Defroster Tab
0.6 hr
*This is a unique Labor Operation for Bulletin use only.
Version 6
Modified Released May 24, 2016
Revised June 6, 2016 – Removed 2012–2014 models from Model Years.
Revised January 18, 2018 — Updated Model and Parts Information.
Revised January 26, 2018 — Updated Parts Information.
Revised February 19, 2019 — Added Model Year 2019 vehicles.
Revised December 15, 2020 — Added Model Year 2020 vehicles.

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